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The Ripper Miner--an All-purpose Excavation Method.

Authors
Larson-DA; Morrell-RJ
Source
Paper in Mining Tech Economics and Policy 1990 :509-524
Link
NIOSHTIC No.
10011061
Abstract
The U.S. Bureau of Mines has developed an extraction system called the ripper miner. This concept uses a single, wide bit that attacks the rock at a shallow angle and slow speed. Research has demonstrated that the system is capable of excavation rates exceeding those possible with conventional drill-blast and can effectively cut rock too hard for roadheaders or continuous mining machines. The soft-rock version has the additional advantages of low bit wear and low dust generation. A single ripper miner can perform the functions of a continuous mining machine, a roadheader excavator, and a tunnel-boring machine. This paper presents the results of full-scale laboratory tests performed in both soft and hard rocks using two different cutterheads. It also includes a comparison of the ripper miner to systems currently used from the standpoint of energy efficiencies and operating costs.
Publication Date
19900101
Document Type
OP;
Fiscal Year
1990
NTIS Accession No.
NTIS Price
Identifying No.
OP 216-91
NIOSH Division
TCRC;
Source Name
Paper in Mining Tech., Economics and Policy 1990. Am. Min. Congr., PP. 509-524
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